The document discusses various types of risks that can be associated with complex projects. It identifies measurable risks that can be quantified through probabilities, as well as immeasurable risks from single events that cannot be quantified. It also categorizes risks as manageable, insurable, investment-related, strategy-related, conditional, completion-related, permitting-related, and more. The document provides examples of different risk factors and aims to provide a comprehensive overview of the risk landscape for complex projects.